Terranova heres a link if you go down and you'll see one similar.
https://www.jalopyjournal.com/forum/...ontend.710599/
Jack up frontend , turn wheels and mark a line with chalk all the way round in the middle.
then use a fine scribe, turn wheel again to mark a fine line.
Push car back a few yards then roll forward, set handbrake so it wont roll on you ..safety you know..
Slide the tool to the back of the tyre, set the pointers exactly on the scribed lines.
bring to front of tyre carefully place the pointer on one side on the scribed line and see how much its over hanging the scribed line on the other side, its only small like the 1/16 or 1/8 " adjust the drag link to achieve. Now re-do it all over again to check.